Prometeus is a Mac OS X app that is analogous to PSP apps for PC such as UMD tools (compress, decompress, using ISO, CSO and DAX; create/unpack POPS-compatible PSX games). Further functions include a USB host mode for USBFS on the PSP. A Pro version is available for €1 that offers a few extras (AT3/PMF support with POPS, previews of what your menu will look like), but is available on a Demo (The program can be used six times, then must be restarted in order to be used again).